Machine for twisting augers



(No Model.) 3 Sheets-Sheet 1-.

I. A. SNELL.

MACHINE FOR TWISTING AUGERS. No. 257,399. PatenteidMaJy 2,1882.

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WITNESSES lNVENTOR I ATTORNEYS N. PETERS, Phnwumo m her, Washinglon. n C.

(No Model.)

3 Sheets-Sheet 2. P. A. SNELL.

MAGHINE FORTWISTING AUGERS.

Patented May2,1882,

IINVENTOR ATTORNEYS w nu ESSES N. PEIERS Phoxu-ulho hur. Washin ton, D. (L

(No Model.) v v 3 Sheets-Sheet 3..

v F. A. SNELL.

MACHINE FDR TWISTING AUGERS,

IIIIIIIIIHH Patented May 2 q H IN ENTOR WW 4 ATTORNEY-S wzmessas UNiTED STATES PATENT OFFICE."

FRED A. SNELL, or FISKDALE, MASSACHUSETTS.

MACHINE FOR TWISTING AUGERS.

SPECIFICATION forming part'of Letters Patent No. 257,399, dated May 2, 18 82.

Application filed February 9, 1882.

To all whom it may concern:

Be it known that 'I, FRED A. SNELL, a citizen of the United States, resident of Fiskdale, in the county of \Vorcester and State of Massachusetts, have invented a new and valuable Improvement in Machines forT'wisting Angers and Auger-Bits; and I do hereby declare that the followingis a full,clear, and exact description of the construction and operation of the same, reference being bad to the annexed drawings, making a part of this specification, and to the letters and figures of reference marked thereon. A

Figure 1 of the drawings is a representation of a Side view of my improved twisting-mm necting the shafts of the rolls and the hollowbit-holdingshaft'; and of theslotted gear-bearing lever, all as hereinafter set forth.

This machine is designed for twisting angers or bits, but does not form the head or cutting portion. That portion of a bit or anger which is to he twisted is first forged in flat form with parallel sides, and in this form iscalled a plate. By the mechanism hereinafter described the plate, having been firstinserted into the rotary hollow shaft,is drawn therefrom as fast as twisted by means of the feeding-rolls, as hereinafter explained. g

In the accompanying drawings, theletter A designates the main casting or bed of the machine.

R B: indicate the feeding-rolls, mounted on the parallel shafts S S, which are seated in the bearings B 13, carried on the ends of arms A A. The feeding-rolls are cylinders of short axial length, and in their peripheries (No model.)

A pattern is first prepared by burning into the periphery of a simple wooden cylinder of the required length and diameter a number of matrices of its hollowsand edges by means of a red-hot bitor-auger twist. Having thus obtained a pattern, a casting is procured therefrom; but before using the Same, in order to renderthe roll complete and perfect in its action, it is proper to cut away the stock oriron which constitutes the matrices of the edges of the bit or anger,'therehy leaving oblique groovesor intervals 0 between the matrices I) of the hollows, so that when the twisted bitor anger is 'rolledbetwcen two of these rolls the edges ofthebit will not hear on the iron, but will be left free, thus rendering it doubly sure that'the hollows will bear on their respective matrices b. These rolls are designed. to efi'ect several important purposes in the operation of the machine: first, to prevent from revolving with the hollow shaft that portion of the bit i or anger plate which remains outside, of it, being the portion which lies between the thiiiiblc-aperture andthe rolls; secondly, to draw the bit or anger shaft away from the hollow shaft exactly and equally as fast as the plate is twisted by said shaft; and, thirdly, to serve as a pair of crimp-dies to make true and uniform the twist of the bit or auger.

E E indicateslides seated in bearings c o each side of the'bed, and carrying each an arm,

operated the rolls are caused to approximate or recede from each other.

In order toturn therolls thefollowing mechanism is to be employed. Worm-gears W are rigidly fastened to the lower ends of the shafts S and areoperatedbyright-and-leftwormsgg on a shaft, S, which is provided with a bevel- .gear, G, to which motion is transmitted from the main shaft S by means of a train of wheels,

IOO

G G G G, the latter being carried on the main shaft. The gear G is loose on the main shaft, and is driven .by the collar V, which is tight on the shaft, and is provided with a pro= jecting bolt-head, h, which is designed to engage a projection, h, on the gear. This construction is adopted in order to enable the main shaft to be revolved through nearly one complete revolution before transmitting circular motion to the rolls.

S represents the main shaft, which runs in bearings b b, and is made hollow to receive the plate of a bit or anger. The shaft is driven by means of the large pulley D, which is loose on said shaft, but engages a clntchcollar, moving on a spline on the shaft. On the front end of the shaft a left-hand thread, It, is cut to receive a thimble, Z, the end of which is provided with a rectangular aperture, 121, of proper size to permit the introduction of a bit or anger 1 plate into the hollow or chamber of the shaft S.

Now, if a bit or anger plate is introduced between the rollsinto this aperture until the shank of the bit touches the rolls', and the rolls are closed, the bit-plate is in position ready for twisting. The machine being started, the main shaft S makes nearly a revolution, as stated above, before giving motion to the rolls, thereby twisting about two hollows'of the plate, and fitting it to enter the rolls. These now begin to revolve and draw the plate out of the aperture at exactly and equally as fast as the hollowshaft performs the twisting. For bits of 1 different size different sets of'rolls must be employed in the machine,.and the gear G must be changed so that the rolls shall draw out the I bit at the exact speed required to give the nec- "havingdifierentnumbers of teeth are provided,

essary pitch .to the twist of the bit. Gears G and the method of changing the wheels is like that employed in engine lathes for cutting justed to mesh with the wheel G.

screws. Theintermediategear-wheel,G,running on stud P, is first removed. The proper gear G is thenput in place. The intermediate gear is then replaced on the stud P, which moves in a slot, 1", in the lever L, and is ad- The lever L, which is fulcrumed on thecenter bearing, 1,

of the wheel G, isthen moved until the wheel G also meshes with the wheel G of the main shaft. Theleveris then secured by means of a bolt, q, to the arm B of the bed, said bed or casting in front to admit the gear G. ,7

ripheries the matrices b of a bit or anger hollow or concave, substantially as specified.

2. The combination, with a pair of rolls having peripheral bit or anger hollow matrices, and a hollow rotating shaft extending at right angles to the plane of the axes of said rolls, of connecting-gearoperating said rolls and said shaft at the same time, substantially as specified.

3. The combination, with the rolls R and their 'shafts,'the slides E, having bearings B, and box-nuts n n, of the right-and-left worm O, and mechanism for turning the same, as specified.

4. The combination, with a pair of hollow matrix rolls and-the shafts S S, on which they are seated, of the hollow rotary bit-holding shaft, its thimble having a rectangular aperture, and mechanism, substantially as described, connecting the shafts S S', as specified.

' 5. The combination, with the rolls R, their bearing-slides E, nuts n, and right-and-left worms 0 g, of the hollow shaft S, loose pulley D, clutch O, collar and gearing W G G G G G, substantially as specified.

6. The combination, with the rolls B, their bearing-slides E, nuts 11, and right-and-left worms 0 g, of the hollow shaft S, loose pulley D, clutch C, collar V, gearing W G G G G G, and slotted leverL, substantially as specified. v

7. The combination, with the rolls, their bearing slides E, nuts n, right-and-left worms 0 g, and the hollow shaft S, loose pulley- D, clutch G, and collar V, of the'connectinggear, thehand-wheel H, its shaft h, and gearwheel G", substantially as specified. I In testimony that I claim the aho ve l have hereunto subscribed my name in the presence of two witnesses.

FRED A. SNELL.

Witnesses: I

MILTON P. HIGGINS, E. T. Soo'r'r. 

